Ametek / VTI Instruments / VXI Technology SM3001 (1 x 64) Two-Wire 2 A Per Channel Multiplexer

The Ametek VTI Instruments SM3001 is a high-density, two-wire multiplexer module for VXIbus systems that routes signals across 64 individual channels, each rated for 2 A continuous switching. Engineered for automated test environments requiring flexible signal distribution, the SM3001 preserves signal integrity through multi-layer PCB design, extensive ground planes, and shielding. Its control circuitry supports quiescent operation to minimize digital noise when switching low-level signals.

The module enables direct register control of all relays, maximizing switching speed by reducing VXIbus backplane traffic. Mix-and-match compatibility with other SMIP (Switch Modularity and Interface Platform) cards allows construction of custom, high-density switching configurations.

Technical Specifications

• Configuration: Two-wire


• Channel Count: 64 channels


• Current Rating per Channel: 2 A (switching and carry)


• Path Resistance: 50 MHz


• Switching Time: < 1 ms


• Mechanical Rated Operations: 100 × 10⁶ cycles


• Electrical Rated Operations: 1 × 10⁶ cycles at full load


• System Compatibility: VXIbus

Key Features

• Individual relay control with direct register access


• Hardware-implemented Break-Before-Make (BBM) and Make-Before-Break (MBB) switching modes


• Synchronous triggering and asynchronous control options


• Programmable timing delays for relay settling times


• Downloadable scan lists with backplane trigger advancement


• Automatic channel sequencing via predefined scan lists

Switching Configurations The SM3001 supports 1-wire, 2-wire, and 4-wire switching topologies, enabling adaptation to diverse measurement architectures. Up to 384 two-wire channels can be housed in a single double-slot VXIbus card (SM1000B) for maximum density applications.

Typical Applications Automated test systems, multi-channel signal routing, high-speed data acquisition, production test environments, and laboratory measurement setups requiring flexible channel switching and low-noise operation.